Mein Partner behauptet, dass er mich gewarnt hat, aber ich hätte zuhören sollen.

Questions & Answers about Mein Partner behauptet, dass er mich gewarnt hat, aber ich hätte zuhören sollen.

Why do we use two infinitives (zuhören sollen) at the end instead of a past participle like "zugehört"?
This is the special "double infinitive" rule for modal verbs. When you express a past regret using Konjunktiv II, you use hätte plus the infinitive of the main verb (zuhören) and the infinitive of the modal verb (sollen). You do not use a past participle for the modal verb when it's paired with another verb.
Since zuhören is a separable verb, why isn't it separated or written as zuzuhören here?
Modal verbs like sollen always connect directly to the pure infinitive of the main verb. They never trigger the extra grammar word "zu" (to). Because it is acting as a pure infinitive in this structure, the separable prefix zu- stays firmly attached to the root verb hören.
Where exactly does the conjugated verb hätte go when using a double infinitive?
It follows standard word order rules for whatever type of clause it is in. Here, aber is a coordinating conjunction (which counts as position 0). The subject ich is position 1, so the helping verb hätte takes its normal place in position 2. The heavy "double infinitive" block (zuhören sollen) gets pushed to the very end of the clause.
In the middle clause, why is the helping verb hat placed after the past participle gewarnt?
This is a quick reminder about subordinate clauses. The word dass (that) always kicks the conjugated verb to the very end of its clause. Since the helping verb hat is the conjugated verb here, it is forced to go after the past participle gewarnt.

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